tert-butyl 4-(4-bromo-2-(4-(3,3,3-trifluoropropyl)piperazin-1-yl)phenylcarbamoyl)-2,3-difluorobenzylcarbamate

1-(5-bromo-2-nitrophenyl)piperazine

ethyl 4-(bromomethyl)-2,3-difluorobenzoate

ethyl 4-(aminomethyl)-2,3-difluorobenzoate

4-((tert-butoxycarbonylamino)methyl)-2,3-difluorobenzoic acid